Use ECMAScript modules

webdata/app/socket.mjs

@@ -0,0 +1,66 @@
+/*
+ *    Copyright (c) 2018-2019, 2023 Unrud <unrud@outlook.com>
+ *
+ *    This file is part of Remote-Touchpad.
+ *
+ *    Remote-Touchpad is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    Remote-Touchpad is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import jsSHA from "./sha256.mjs"
+
+const challengeResponse = (message, secret) => {
+    const shaObj = new jsSHA("SHA-256", "TEXT");
+    shaObj.setHMACKey(message, "TEXT");
+    shaObj.update(secret);
+    return btoa(shaObj.getHMAC("BYTES"));
+};
+
+export default class Socket extends EventTarget {
+    #secret;
+    #authenticated;
+    #ws;
+
+    constructor(url, secret) {
+        super();
+        this.#secret = secret;
+        this.#authenticated = false;
+        this.#ws = new WebSocket(url);
+        this.#ws.addEventListener("message", this.#handle_ws_message.bind(this));
+        this.#ws.addEventListener("close", this.#handle_ws_close.bind(this));
+    }
+
+    #handle_ws_message(event) {
+        if (!this.#authenticated) {
+            this.#ws.send(challengeResponse(event.data, this.#secret));
+            this.#authenticated = true;
+            return;
+        }
+        let config;
+        try {
+            config = JSON.parse(event.data);
+        } catch (e) {
+            this.#ws.close();
+            throw (e);
+        }
+        this.dispatchEvent(new CustomEvent("config", {detail: config}));
+    }
+
+    #handle_ws_close() {
+        this.dispatchEvent(new CustomEvent("close"));
+    }
+
+    send(message) {
+        this.#ws.send(message);
+    }
+}